header {
    background-color: var(--color-bg);
    color: var(--color-text);
    padding: 1rem;
    position: relative;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}
.header-main {
    display: flex;
    align-items: center;
    gap: 1rem;
    width: 100%;
}
.hamburger {
    display: none;
}
header h1 a {
    color: var(--color-text);
    text-decoration: none;
    font-family: var(--font-heading),sans-serif;
}
header h1 a span {
    color: var(--color-accent);
}
nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0.5rem 0.8rem;
    display: flex;
    justify-content: space-between;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    background-color: var(--color-card);
    width: 100%;
    max-width: 560px;
    gap: 0.5rem;
}
nav li {
    margin: 0;
    padding: 0.5rem;
    transition: background-color var(--transition-fast);
    flex: 1;
    text-align: center;
    border-radius: 8px;
}
nav a {
    color: var(--color-text);
    text-decoration: none;
    transition: color var(--transition-fast);
    font-size: clamp(0.9rem, 0.45vw + 0.7rem, 1.1rem);
    font-family: var(--font-heading),sans-serif;
}
nav a.is-disabled {
    color: var(--color-text-secondary);
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}
nav li:hover {
    background-color: rgba(255, 255, 255, 0.06);
}
nav li:hover a {
    color: var(--color-text);
}
nav li:hover a.is-disabled {
    color: var(--color-text-secondary);
}
nav {
    flex: 1;
    display: flex;
    justify-content: center;
    position: relative;
}
.menu-toggle {
    display: none;
}

@media (min-width: 769px) {
    .header-main {
        justify-content: space-between;
    }
    nav {
        position: absolute;
        left: 50%;
        transform: translateX(-50%);
        width: 50%;
        justify-content: center;
    }
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}
.profile-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    background: transparent;
    border: 1px solid rgba(0, 194, 129, 0.4);
    color: var(--color-text);
    padding: 0.4rem 0.8rem;
    border-radius: 999px;
    cursor: pointer;
}
.profile-btn[hidden] {
    display: none;
}
.profile-btn:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}
.profile-name {
    font-weight: 600;
}
.profile-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--color-accent);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.profile-avatar svg {
    width: 20px;
    height: 20px;
    fill: none;
    stroke: #000;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}
.logo {
    width: 200px;
    height: auto;
    margin: 0;
}
.signup-btn {
    background: var(--color-accent);
    color: #000;
    border: none;
    padding: 0.75rem 1.5rem;
    white-space: nowrap;
    cursor: pointer;
    border-radius: var(--radius-button);
    font-weight: 700;
    box-shadow: var(--shadow-accent);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.signup-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 0 35px rgba(0, 194, 129, 0.8);
}


@media (max-width: 1080px) and (min-width: 769px) {
    header {
        padding: 0.8rem;
        gap: 0.7rem;
    }
    nav {
        width: 58%;
    }
    nav ul {
        max-width: 100%;
        padding: 0.35rem 0.6rem;
        gap: 0.25rem;
    }
    nav li {
        padding: 0.35rem 0.25rem;
    }
    .logo {
        width: clamp(145px, 16vw, 180px);
    }
    .signup-btn,
    .profile-btn {
        padding: 0.45rem 0.75rem;
    }
}
/*Mobile Optimisation*/
@media (max-width: 768px) {
    header {
        display: grid;
        grid-template-columns: auto 1fr auto;
        grid-template-areas:
            "hamburger logo actions"
            "nav nav nav";
        align-items: center;
        row-gap: 0.75rem;
    }
    .header-main {
        display: contents;
    }
    .header-right {
        display: contents;
    }
    .hamburger {
        display: block;
        cursor: pointer;
        font-size: 1.5rem;
        color: var(--color-text);
        padding: 0.5rem;
        grid-area: hamburger;
        justify-self: start;
        -webkit-user-select: none;
        user-select: none;
    }
    .logo-link {
        grid-area: logo;
        justify-self: center;
    }
    .logo {
        width: 160px;
    }
    nav {
        grid-area: nav;
        width: 100%;
    }
    nav ul {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--color-card);
        margin: 0;
        padding: 0;
        border: none;
        border-radius: 0 0 10px 10px;
        z-index: 10;
        overflow: hidden;
    }
    nav li {
        margin: 0;
        width: 100%;
        border-bottom: 1px solid var(--color-border);
        border-radius: 0;
        display: flex;
    }
    nav li:last-child {
        border-bottom: none;
    }
    nav a {
        display: block;
        padding: 1rem;
        width: 100%;
        height: 100%;
        flex: 1;
    }
    nav a.is-disabled {
        pointer-events: none;
    }
    nav li:hover {
        background-color: rgba(255, 255, 255, 0.06);
    }
    nav li:hover a {
        color: var(--color-text);
    }
    .menu-toggle {
        display: none;
    }
    .menu-toggle:checked ~ ul {
        display: flex;
    }
    .signup-btn,
    .profile-btn {
        width: fit-content;
        justify-content: center;
        max-width: 100%;
    }
    .profile-btn,
    .signup-btn {
        grid-area: actions;
        justify-self: end;
    }
}